Marilu on wed 30 mar 05
Hello I am trying to test Ron Roy Floating Blue in a test kiln(paragon
caldera) and reproduce the results in L&L easy fire.-Both the test kiln and
bigger kiln have digital controllers- the recipe is:
Neph sy 30
f 3134 36
Silica 14
Epk 20
RIO 2
Cobalt Carb 1.5
Rutile 4
Bentonite 1.5
I have tested their MC6G recipes with the slow fire and cool and they work
but I understand this Floating Blue does better with a fast fire fast cool.
I looked for info on firing schedules for this recipe but can't find
specifics. I am not sure what firing schedule to try. Could some one share
one that worked with this recipe and do I use the exact same schedule in the
test kiln as in the big kiln? I tried to fire up to cone 6 using the L&L
fast glaze profile they have in their manual and just shut the test kiln off
once it reached temperature but I don't know if that is what is meant by a
fast cool down -it seemed awfully fast in the test kiln and I am sure the
bigger kiln won't cool like that.-the results were not good just came out
ugly brown and the cone 7 bent to 5'Oclock-which I know wasn't because of
the cooling- I missed a segment and it was supposed to go at 300 up to 1000
then 150 to 1100- I jusat went back over it and realized I fired 300 up to
1100 and skipped the 150 rate.-so that was one problem. I can ramp down but
I don't know what rates to use for a fast cool for this glaze. Thank you for
any help.-Marilu
John Rodgers on thu 31 mar 05
Marilu,
I work with Floating Blue as my main glaze and here is what I have learned.
First, I use the Floating Blue recipe from Chappelles book on glazes. It
uses Gerstley Borate instead of a frit.. Also, I use no bentonite.
Floating Blue (Varigates)
Cone 5 Oxidation
EPK - 5.4
Gerstley Borate 27
Neph Sye 47.3
Silica 20.3
Add:
RIO 2.0
Cobalt Oxide 1.0
Rutile 4.0
*Use Distilled Water only. Adjust the Specific Gravity or Density to 1.3
*
I use Cone 5 B-Mix from Laguna, and sometimes Standard C-5 Grolleg. I
both dip and spray.
Dipping: submerge for 15-20(max) seconds. When dipping, after glaze is
dry, use the fingers to rub dry glaze into any pinholes and the holes
made by the dipping tongs.
Spray: 10 coats of glaze.
The glaze turns brown where thin. I deliberately use that characteristic
to make a blue and brown combination for decorative purposes. Blue and
brown together makes a nice mix. The glaze finishes somewhat glossy.
As FB is fired at progressively hotter temperatures it changes a good
bit. At cone 5 it is a nice varigated blue, at cone 6 it begins to run
and shifts towards blue-grey to grey-green, at cone 7 it is a serious
snot greet and most likely will be stuck to the shelves.
Bisqued B-mix for FB seems to work best when fired long and slow up to
cone 06. If fired to fast, pin-holing in the glaze fireing becomes
pronounced at times, so bisque long and slow. I usually set my kiln to
fire to bisque using the "Medium" setting. That allows a long slow climb
to temperature. When glaze firing, I also fire up slowly in a big
Paragon SnF kiln, and it takes 9-1/2 to 10 hours for glaze firing if the
kiln is full. I fire with the bottom plug out of the kiln. This kiln
gives me good firings of FB using the small cones for the Dawson Kiln
Sitters. However, the absolute best firings I have ever gotten with FB
was manual firing in my old Crusader kiln. In that kiln I used shelf
witness cones - cone 5. When the cone was at the three-oclock position,
I would turn off the kiln, I would then turn an oscillating fan onto the
kiln to force a faster cooling. But I don't open the kiln until it is
back down to 100 degrees or room temperature.
I like FB very much, and it is one of my principle glazes. I rarely have
trouble with it.
Good Luck,
John Rodgers
Chelsea, AL
Marilu wrote:
>Hello I am trying to test Ron Roy Floating Blue in a test kiln(paragon
>caldera) and reproduce the results in L&L easy fire.-Both the test kiln and
>bigger kiln have digital controllers- the recipe is:
>Neph sy 30
>f 3134 36
>Silica 14
>Epk 20
>RIO 2
>Cobalt Carb 1.5
>Rutile 4
>Bentonite 1.5
>I have tested their MC6G recipes with the slow fire and cool and they work
>but I understand this Floating Blue does better with a fast fire fast cool.
>I looked for info on firing schedules for this recipe but can't find
>specifics. I am not sure what firing schedule to try. Could some one share
>one that worked with this recipe and do I use the exact same schedule in the
>test kiln as in the big kiln? I tried to fire up to cone 6 using the L&L
>fast glaze profile they have in their manual and just shut the test kiln off
> once it reached temperature but I don't know if that is what is meant by a
>fast cool down -it seemed awfully fast in the test kiln and I am sure the
>bigger kiln won't cool like that.-the results were not good just came out
>ugly brown and the cone 7 bent to 5'Oclock-which I know wasn't because of
>the cooling- I missed a segment and it was supposed to go at 300 up to 1000
>then 150 to 1100- I jusat went back over it and realized I fired 300 up to
>1100 and skipped the 150 rate.-so that was one problem. I can ramp down but
>I don't know what rates to use for a fast cool for this glaze. Thank you for
>any help.-Marilu
>
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